I have inherited a Joomla Site version 1.5.26. I have cloned the site data and copied the DB to a subdomain, changed the configuration.PHP file to reflect access to the cloned DB and verified all site data and links are working properly. I then loaded jUpgrade and went through the process of migration. It completed successfully to version 2.5.6. I then loaded the new template version 2.5 and extensions. Some adjusting of module positions was needed as they didn't always transfer properly, e.g. a module was listed as "position-6" when it should have been "right".
NOW that I have tweaked these settings their is still the glaring issue with the articles. They are all visible on the backend, but on the front-end they don't appear except for a strange link to them. Once the link is clicked, the article loads properly within the page.
Here are the sites both before and after for reference.
Pre-Upgrade J1.5.26: http://dev.revcoproducts.com
Post-Upgrade J2.5.6: http://dev.revcoproducts.com/jupgrade
Thanks for looking.